I'm back with "new" problem, i always use the last beta. I use a usb pendrive 16GB parted with 4 partitions. When i deploy a BartPE on the first partition, the system boot. If i use any other partition with same filesystem ( FAT or NTFS ), i've a BSOD (07b) ... it's a problem with my filesystem ? partition method ? drivers ? Same problem with my XP install, after the first blue page with driver charging, "wait black screen" , and same BSOD ... always on NO first Partition. an Idea plz ? Ps: if you want , i can use googletranslator for my craps english . edit: it possibly my bios ... but on my laptop native usb2 Dell D630 and on my destop with msi neo-combo2 motheboard, it's same problem... i've try change the bios option : Hypertheading, multi CPU usage ... always BSOD.